Collisional-radiative recombination Ar++e+e: Experimental study at 77–180 K

Abstract

Rate coefficients for collisional-radiative recombination (CRR) of ${\mathrm{Ar}}^{+}$ ions with electrons have been measured at temperatures from $77 $to $180 \mathrm{K}$ in a helium-buffered flowing-afterglow (Cryo-FALP) experiment at electron densities ${n}_{e}$ from ${10}^{8}$ to ${10}^{10} {\mathrm{cm}}^{\ensuremath{-}3}$. The measured ternary rate coefficient ${K}_{\mathrm{CRR}}$ at $77 \mathrm{K}$ is $(1.1\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17} {\mathrm{cm}}^{6}{\mathrm{s}}^{\ensuremath{-}1}$ and the observed variation with temperature agrees well with the theoretical ${T}^{\ensuremath{-}4.5}$ dependence.